[英]Using the output of an SQL statement in another SQL statement?
我正在嘗試將輸出從一個SQL語句轉換為另一條SQL語句,盡管它似乎不起作用。 是否有替代方案,我將如何使用?
$id = ($_SESSION["user_id"]);
$query1 = "SELECT event_id FROM booking where user_id = '$id'";
$result = mysql_query($query1);
$query2 = "SELECT * FROM event where event_id = '$result'";
$results = mysql_query($query2);
您可以加入表格,嘗試使用以下語法
SELECT event.event_id,booking.*
FROM event
JOIN booking on event.event_id=booking.event_id
WHERE booking.user_id='$id';
如何使用一個查詢而不是兩個查詢:
$id = ($_SESSION["user_id"]);
$query2 = "SELECT * FROM event
where event_id IN (SELECT event_id
FROM booking
where user_id = '$id')";
$results = mysql_query($query2);
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